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NACA Duct
A NACA duct, also sometimes called a NACA scoop or NACA inlet, is a common form of low- drag air inlet design, originally developed by the U.S. National Advisory Committee for Aeronautics (NACA), the precursor to NASA, in 1945. Design Prior submerged inlet experiments showed poor pressure recovery due to the slow-moving boundary layer entering the inlet. The NACA design is believed to work because the combination of the gentle ramp angle and the curvature profile of the walls creates counter-rotating vortices which deflect the boundary layer away from the inlet and draws in the faster moving air, while avoiding the form drag and flow separation that can occur with protruding scoop designs. Aircraft applications When properly implemented, a NACA duct allows air to flow into an internal duct, often for cooling purposes, with a minimal disturbance to the flow. The design was originally called a submerged inlet, since it consists of a shallow ramp with curved walls recessed into ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Racing Car
Auto racing (also known as car racing, motor racing, or automobile racing) is a motorsport involving the racing of automobiles for competition. Auto racing has existed since the invention of the automobile. Races of various sorts were organised, with the first recorded as early as 1867. Many of the earliest events were effectively reliability trials, aimed at proving these new machines were a practical mode of transport, but soon became an important way for automobile makers to demonstrate their machines. By the 1930s, specialist racing cars had developed. There are now numerous different categories, each with different rules and regulations. History The first prearranged match race of two self-powered road vehicles over a prescribed route occurred at 4:30 A.M. on August 30, 1867, between Ashton-under-Lyne and Old Trafford, a distance of eight miles. It was won by the carriage of Isaac Watt Boulton. Internal combustion auto racing events began soon after the constructio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Engine Technology
An engine or motor is a machine designed to convert one or more forms of energy into mechanical energy. Available energy sources include potential energy (e.g. energy of the Earth's gravitational field as exploited in hydroelectric power generation), heat energy (e.g. geothermal), chemical energy, electric potential and nuclear energy (from nuclear fission or nuclear fusion). Many of these processes generate heat as an intermediate energy form, so heat engines have special importance. Some natural processes, such as atmospheric convection cells convert environmental heat into motion (e.g. in the form of rising air currents). Mechanical energy is of particular importance in transportation, but also plays a role in many industrial processes such as cutting, grinding, crushing, and mixing. Mechanical heat engines convert heat into work via various thermodynamic processes. The internal combustion engine is perhaps the most common example of a mechanical heat engine, in whi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human-powered Transport
Human-powered transport is the transport of person(s) and/or goods using human muscle power. Unlike animal-powered transport, human-powered transport has existed since time immemorial in the form of walking, running and swimming. Modern technology has allowed machines to enhance human-power. Although motorization has increased speed and load capacity, many forms of human-powered transport remain popular for reasons of cost, convenience, leisure, physical exercise, and environmentalism. Human-powered transport is sometimes the only type available, especially in underdeveloped or inaccessible regions. Modes Non-vehicular *Crawling (human) *Walking (233 watts at 3 mph) ** Walking bus *Running (1,150 watts at 10 mph) * Sprinting (1,690 watts at 15 mph) *Swimming *Climbing and mountaineering *Ice skating, roller skating, and inline skating * Cross-country skiing Human-powered vehicles (HPVs) Land vehicles Skateboards have the advantage of being so small and light tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NACA Cowling
The NACA cowling is a type of aerodynamic fairing used to streamline radial engines installed on airplanes. It was developed by Fred Weick of the National Advisory Committee for Aeronautics (NACA) in 1927. It was a major advance in aerodynamic drag reduction, and paid for its development and installation costs many times over due to the gains in fuel efficiency that it enabled. History and design The NACA cowling enhanced speed through drag reduction while delivering improved engine cooling. The cowling consists of a symmetric, circular airfoil that is wrapped around the engine. In a normal planar airfoil, like a wing, it is the difference in airspeed, and their associated changes in pressure, on the top and bottom of the surface that produces lift. In the case of the NACA cowl, the ring-shaped airfoil is positioned so this lift effect is forward, producing thrust. This thrust does not counteract the total drag of the cowl, but greatly reduces its overall value. The differenc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NACA Airfoil
The NACA airfoils are airfoil shapes for aircraft wings developed by the National Advisory Committee for Aeronautics (NACA). The shape of the NACA airfoils is described using a series of digits following the word "NACA". The parameters in the numerical code can be entered into equations to precisely generate the cross-section of the airfoil and calculate its properties. Origins NACA initially developed the numbered airfoil system which was further refined by the United States Air Force at Langley Research Center. According to the NASA website: Four-digit series The NACA four-digit wing sections define the profile by: # First digit describing maximum camber as percentage of the chord. # Second digit describing the distance of maximum camber from the airfoil leading edge in tenths of the chord. # Last two digits describing maximum thickness of the airfoil as percent of the chord. For example, the NACA 2412 airfoil has a maximum camber of 2% located 40% (0.4 chords) from the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Honda VFR750F
The Honda VFR750F is a motorcycle manufactured by Japanese automobile manufacturer Honda from 1986 to 1997. The model was initially displayed to the press after the 1985 Bol d'Or before it was officially introduced in 1986. The motorcycle is a variation of sport bike and sport touring. The motorcycle is powered by a V4 engine that was developed from the VF700/750F models. The motorcycle's design is an evolution and complete redesign of the VF700/750F models. This redesign included multiple new features, including greater power output (104 hp up from 83 hp), lighter weight (claimed down 20 kg), a lower centre of gravity, a wider front tire, a slightly shorter wheelbase (15mm), six gear ratios instead of five and gear driven cams. Engine The Honda VFR750F uses a V4 engine that is primarily made of cast aluminium alloy, with the crankcase breather being divided horizontally. The engine is a carburettor-based air/fuel induction, , 16-valve, gear-driven DOHC, li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nissan S130
The Nissan S130 is a sports coupé produced by Nissan in Japan from 1978 until 1983. It was sold as the Datsun 280ZX, Nissan Fairlady Z and Nissan Fairlady 280Z, depending on the market. In Japan, it was exclusive to Nissan Bluebird Store locations. It was the second generation Z-car, replacing the Nissan S30 in late 1978. The 280ZX was the first time the "by Nissan" subscript was badged alongside the Datsun logo, along with Nissan trucks. The 280ZX was ''Motor Trend's'' import car of the year for 1979. The 280ZX was replaced by the Nissan 300ZX in 1984. Design goals The 280ZX was a complete redesign, retaining only the L28 inline-six engine and other driveline components from the 280Z. Both two-seat and four-seat (2+2) designs were offered. Compared to the more overtly sporting earlier models, the 280ZX was a much softer, heavier car, with less focus on driving and more on driver comfort and refinement. Softer suspension, better sound insulation, more comfortable seats, and am ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porsche 924
The Porsche 924 is a sports car produced by Porsche in Neckarsulm, Germany,from 1976 until 1988. A two-door, 2+2 (car body style), 2+2 coupé, the 924 replaced the Porsche 912, 912E and Porsche 914, 914 as the company's entry-level model. Although the Porsche 928, 928 was designed first, the 924 was the first production road-going Porsche to use Water cooling#Internal combustion engines, water cooling and a front-engine, rear-wheel-drive layout. It was also the first Porsche to be offered with a conventional fully automatic transmission. The 924 made its public debut in November 1975 and a turbocharged version was introduced in 1978. In response to increasing competition, Porsche introduced an upgraded and re-engined version as the Porsche 944, 944, which replaced the 924 in the U.S. in 1983. In 1985, Audi discontinued the engine used in the 924, prompting Porsche to use a slightly detuned 944 engine in the 924, rename the vehicle as the 924S, and reintroduce it in the U.S. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Porsche 911 GT2
The Porsche 911 GT2 is a high-performance, track-focused sports car built by the German automobile manufacturer Porsche from 1993 to 2009, and then since 2010 as the GT2 RS. It is based on the 911 Turbo, and uses a similar twin-turbocharged engine, but features numerous upgrades, including engine enhancements, larger brakes, and stiffer suspension calibration. The GT2 is significantly lighter than the Turbo due to its use of rear-wheel-drive instead of all-wheel-drive system and the reduction or removal of interior components. As a result, the GT2 (now GT2 RS) is the most expensive and fastest model among the 911 lineup. 993 generation The 993 GT2 was initially built in order to meet homologation requirements for GT2 class racing. Because the cars were built to meet the GT2 class regulations, the road cars were named accordingly (but badged as the 911 GT). The 993 GT2 featured widened plastic fenders and a larger rear wing with air scoops in the struts for improved engine ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pontiac GTO
The Pontiac GTO is an automobile that was manufactured by American automaker Pontiac from 1963 to 1974 for the 1964 to 1974 model years, and by GM's subsidiary Holden in Australia for the 2004 to 2006 model years. The first generation of the GTO is credited as popularizing the muscle car market segment in the 1960s. The Pontiac GTO is considered by some to have started the trend with all four domestic automakers offering a variety of competing models. For the 1964 and 1965 model years, the GTO was an optional package on the intermediate-sized Pontiac Lemans. The 1964 GTO vehicle identification number (VIN) started with 22, while the 1965 GTO VIN started with 237. The GTO became a separate model from 1966 to 1971 (VIN 242...). It became an optional package again for the 1972 and 1973 intermediate LeMans. For 1974, the GTO was an optional trim package on the compact-sized Ventura. The GTO was selected as the ''Motor Trend'' Car of the Year in 1968. The GTO model was revived ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ford Mustang
The Ford Mustang is a series of American automobiles manufactured by Ford. In continuous production since 1964, the Mustang is currently the longest-produced Ford car nameplate. Currently in its sixth generation, it is the fifth-best selling Ford car nameplate. The namesake of the "pony car" automobile segment, the Mustang was developed as a highly styled line of sporty coupes and convertibles derived from existing model lines, initially distinguished by "long hood, short deck" proportions. Originally predicted to sell 100,000 vehicles yearly, the 1965 Mustang became the most successful vehicle launch since the 1927 Model A. Introduced on April 17, 1964 (16 days after the Plymouth Barracuda), over 400,000 units in its first year; the one-millionth Mustang was sold within two years of its launch. In August 2018, Ford produced the 10-millionth Mustang; matching the first 1965 Mustang, the vehicle was a 2019 Wimbledon White convertible with a V8 engine. The success of the M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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